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1、高雷诺数超声速混合层标量输运与扩散特性研究进展*收稿日期:2015-10-9基金项目:国家自然科学基金资助项目(11572346)作者简介:沈赤兵(1968—),男,博士,研究员,博士生导师。E-mail:cbshen@nudt.edu.cn沈赤兵1,2,石少平3,冯军红1,2(1.国防科技大学航天科学与工程学院,湖南长沙410073;2.国防科技大学高超声速冲压发动机技术重点实验室,湖南长沙410073;国防科技大学训练部,湖南长沙410073)摘要:组合循环发动机内部的富燃燃气与空气的混合过程具有高雷诺数、超声速混
2、合的特点,混合层内的温度、组分浓度等标量输运与扩散过程是制约气气混合与燃烧过程的重要因素。高雷诺数条件下,混合层内的湍流尺度、动量与标量输运和扩散、涡形态、标量界面演化呈现更为复杂的物理机制。本文阐述了超声速混合层标量混合在组合循环发动机中的应用背景,综述了超声速混合层以及超声速混合层标量混合过程的国内外研究进展,针对高雷诺数超声速混合层标量输运与扩散特性研究中存在的不足提出了解决办法,指出了该领域值得深入开展的研究方向。关键词:组合循环发动机;超声速混合层;标量混合;雷诺数;强化混合中图分类号:V437文献标识码:A
3、文章编号:15100008ScalartransportanddiffusionstudyprogressofsupersonicmixinglayerwithhighReynoldsnumberSHENChibing1,2,SHIShaoping3,FENGJunhong1,2(1.CollegeofAerospaceScienceandEngineering,NationalUniversityofDefenseTechnology,Changsha410073,China;2.ScienceandTechnolo
4、gyonScramjetLaboratory,NationalUniversityofDefenseTechnology,Changsha410073,China;3.TrainingDepartment,NationalUniversityofDefenseTechnology,Changsha410073,China)Abstract:Themixingprocessesoffuel-richgasandairinthecombustorofcombinedcycleenginewasviewedasthesupe
5、rsonicmixinglayerwhichwasfeaturedbythehighReynoldsnumber.Moreover,thetransportanddiffusionprocessesofscalarsincludingtemperatureandconcentrationwereimportantfactorsforcontrollingthegas-gasmixingandcombustionprocess.UnderhighReynoldsnumber,theturbulencescale,thet
6、ransportanddiffusionofscalar,vortexshapeandscalarinterfacialareaofthemixingflowfieldrevealedmorecomplexphysicalmechanisms.Inthispaper,theapplicationbackgroundofthescalarmixinginthesupersonicmixinglayeronthecombinedcycleenginewasintroduced,andthestudyprogressofth
7、esupersonicmixinglayerandthescalarmixingprocessinthesupersonicmixinglayerbothathomeandabroadwassummarized,thenthemethodsforcounteractingtheshortcomingsofthestudyonscalartransportanddiffusioncharacteristicsofsupersonicmixinglayerwithhighReynoldsnumberwereproposed
8、.Finally,somedirectionsbeingworthstudyingdeeplyinthefieldwerepointedout.Keywords:combinedcycleengine;supersonicmixinglayer;scalarmixing;Reynoldsnumber;intensifyingmix